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Javascript implements text jumping effects

高洛峰Original: 2016-12-05 09:55:171512browse

1. How to turn the string into fonts one by one, let us control

1 Get the content of the string

2 Clear the content of the string

3 Traverse the string, and then cut it out one by one.

4 Add positioning to the cut text

5 Reassign the added positioned text to the obtained element.

2. How to realize the text jumping after the mouse slides up

1 Define a variable 0

2 Define a timer

3 Let the variable continue to decrease

4 Change the top of the element == variable

5 When the variable reaches a certain height, let the variable continue to increase

6 When the variable is reduced to 0 (their own position),

7 Clear the animation to change the element's top = 0 (their own position)

<!DOCTYPE html>
<html>
 <head>
  <meta charset="utf-8" />
  <title>
   文字跳动特效-vico
  </title>
  <style type="text/css">
   #txtDom{ padding: 50px; width:500px; margin: 0 auto; font-size: 16px;
   font-family: "微软雅黑"; line-height: 1.3em; text-indent: 2em;}
  </style>
 </head>
 <body>
  <div id="txtDom">
   要是没有错误和失败，你就不会学到东西；要是没有痛苦，你就不会长大。
   一旦你明白了这些，你就知道了一切事情都是为了某种目的而发生。 
   所以不要紧张或者认为生活不公平，因为一切事情都有原因，只有时间能诉说教会了我们什么。
  </div>
  <script type="text/javascript">
   var txtAnim = {
    len: 0,
    txtDom: "",
    arrTxt: [],
    init: function(obj) {
     this.obj = obj;
     this.txtDom = obj.innerHTML.replace(/\s+/g, "");
     this.len = this.txtDom.length;
     obj.innerHTML = "";
     this.addDom();
    },
    addDom: function() {
     for (var i = 0; i < this.len; i++) {
      var spanDom = document.createElement("span");
      spanDom.innerHTML = this.txtDom.substring(i, i + 1);
      this.obj.appendChild(spanDom);
      this.arrTxt.push(spanDom);
     };
     for (var j = 0; j < this.len; j++) {
      this.arrTxt[j].style.position = "relative";
     };
     this.strat();
    },
    strat: function() {
     for (var i = 0; i < this.len; i++) {
      this.arrTxt[i].onmouseover = function() {
       this.stop = 0;
       this.speed = -1;
       var $this = this;
       this.timer = setInterval(function() {
        $this.stop += $this.speed; //0 += -1
        if ($this.stop <= -20) {
         $this.speed = 1;
        }
        $this.style.top = $this.stop + "px";
        if ($this.stop >= 0) {
         clearInterval($this.timer)
         $this.style.top = 0 + "px";
        };
       },
       15);
      };
     }
    }
   }
   var txtDom = document.getElementById("txtDom");
   txtAnim.init(txtDom);
  </script>
 </body>
</html>

The above is The editor introduces to you Javascrip to implement text jumping effects. I hope it will be helpful to everyone

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